Remember that most ISPs and hosting companies have very aggressive anti-spam policies. You should only be sending email to contacts that are expecting to receive email from you. Mach5 Mailer is not licensed for "spam" use.
A Few Kudos...
Rated 5 stars SofoTex.Com
Rated 5 stars at SnapFiles
Send Full-Featured PHP Emails
Easily send customized email messages with full PHP support to an unlimited
number of customers. Send them out at speeds of over 10,000 messages per hour! Simple, Fast, and Effective. Free License available.
Fast Sending. Easy Scheduling. Mach5 Mailer has the power to get the message out using a remote SMTP Server, Local SMTP or Mailer Express! Full ESMTP, SSL, and TLS authentication support.
Fast, Multi-Threaded Sending
Mailer can generate up to 30 messages per second and is designed to take advantage of modern Multi-core CPU's.
Mail Scheduling Built-In
Schedule multiple mailings to fire off as often as you like.
Actively Supported, Developed, and Updated
Mach5 Mailer is constantly updated and upgraded with new features, many taken from customer suggestions. We recently released Mailer 4.5 with full Windows Vista support, a free upgrade for all our Mailer 4 customers.